[5.0] tinyMCE styles

[dgrammatiko]

Pull Request for Issue #40622 .

Summary of Changes

• Add the missing separator
• Remove the outer border radius

Testing Instructions

Run npm ci and create an article, check the tinyMCE editor

Actual result BEFORE applying this Pull Request

Expected result AFTER applying this Pull Request

Link to documentations

Please select:

• No documentation changes for docs.joomla.org needed
• No documentation changes for manual.joomla.org needed

@HLeithner

[Quy]

I have tested this item ✅ successfully on ce9c9f6

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[HLeithner]

thx